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    <title>Document</title>
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<script>

    // 数组塌陷(坍塌)  => 前面的元素被删除之后,后面的元素会批量前移占据被删除的元素的位置
    var arr = [1, 2, 3, 4, 5, 6];
    arr.splice(1, 1);
    console.log(arr);// [1, 3, 4, 5, 6]



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